Feed-wire connection for electric motors.



G. J. HARTMANN.

FEED WIRE CONNECTION FOR ELECTRIC MOTORS.

APPLICATION FILED Nov.11, 1911.

43 42 E15. l 4l 39 45 l' 24s Patented July 2, 1912.

2 SHEETS-SHEET 1.

G. J. HARTMANN. EEED WIRE OONNEOTION EOR ELEOTRIO MOTORS.

APPLICATION FILED NOV. 11, 1911.

Patented July 2, 1912 2 SHEETS-SHEET 2.

INVENTOR. GEQEEBYJ. Ha'rmarm.,

ATTORNEYS NrrnD s ATES i' le GEORGE J. HARTMANN, OF PLAINS, NEW YORK.

FEED-'WIRE CONNECTION FORELEGTBIC MOTORS.

Specification of Letters Patent. Application led November 11, 1911. Serial No. 659,713.

Patented July 2, 1912.

vTo all whom @it may concern: y

Be it known that LGEORGE J. HARTMANN, citizen of the United States, residing at WhitePlains, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Feed- Wire Connections for Electric Motors; and I do hereby declare the following to be a full, clear,"and exact description of the invention, lsuch as will enable others skilledtween the feed wire cable, connected with the service of potential, with the field wires of the electric motor. l

The invention has for its principal object ;to provide a novel, simple, eflicient, and durable couplingsor connection, whereby slack cables containing feed-wires may be quickly andv positively connected with the fieldv wires of electric motors of the portable type, vsuch for example, as portable electricdrill motors, vacuum-cleanermotor's, and all other types of devices Where the movements of either themotor or the slack feed-wire cable ordinarily subjects the contacting portions of the connection, or the wires themselves, to pulls or strains; which, if perf mitted to be exercised, fre uently destroy the ro er connections of eed-wires with the el -wires of the motor, to the injury and incapacitation of the motor. v

The present invention has for a further object to provide a coupling or connection which provides a positive electrical connectioh between the feed-wires and the fieldz wires of motor which is moisture-proof,

short circuit proof, and which prevents strains, pulls, or stresses to be communicated to the connections and the main line Vpotential Wires, due to accidental pulls, jars orvibration of the motor, or of the feed-wire cable.

Other objects of the present invention not at. this time more particularly enumerated will be clearly understood from the follow- .views to indicate corresponding ,phase type, the field 2 bei between the field-wiresl ing detailed description'of the present invention.

With the various objects of the present invention in view, the said invention consists, primarily, in the electrical connection "or coupling hereinafter set forth; and, furthermore, this invention consists in the arrangements and combinations of the various parts,

as well as in the details of the construction thereof, all of which will be hereinafter more fully described, and then finally embodied in the clauses of the claims which are appended to and which form an essential.

part of this specification.

The invention is clearly illustrated in the accompanying drawings, in which :f-

Figure 1 is a side elevation of an electricdrill, the motor of which is equipped with the construction of electrical connection or cou ling for attaching the feed-wire cable to t field-wires of the motor; and Fig. 2 is a large detail longitudinal vertical"section of said construction 4of electrical connection or coupling. Fig. 3 is a detail horizontal section of t e same, on an enlarged scale, and taken upon line 3--3 in said Fig. 2; and

Fig. 4 is a detail longitudinal vertical `eeev tion, taken throu h one of the male and fe male contact-ma ring devices, showing the same in their operative relations.

Similar characters of reference are employed in Aall of the hereinabove described parts. Relerrin now to the several gares of tha drawings, t e reference-character l indicates the motor of an electric-drill in connection with which I have chosen to illustrate the application of my present invention. As shown, the said motor comprises the three- 0 composed of-a. three-phase windin the ree ends of the field-wires 3 of Whic are connected with my construction of electrical connection orcoupling presently to be more fully described. The motor-fieldv is inclosed in a suitable ing 4 which is provided with an openin 5 through which the free ends of said fie dutires are led. Secured to said casing, in any suitable manner, and in registration with said openin is a base-block the same beN ing prefere ly hollowed out to form the 'it nular flange or hub 19, tol which is secured,

tends upwardly an exteriorlythreaded anby means of its int-eriorly threaded portion 10, a tubular shell 11. provided, at its lower end, with a flanged portion y12, the circumferential surfaceof which is provided with' external screwthreads 13. Located within the interior of said shell, -at'any suitable point between its ends, is an annular rib 14, and arranged within said shell, so as to abut against the 4under side of said annular rib, is an insulator-disk 15, which kmay be made of any desiredmaterial which is a non-conductoreof electricity. Carried by said insulator-dlsk are a' series of vupwardly projecting female contact-members 16,l each of which is provided with an internally screw-threadedv and.

reduced extension 17, extending into said insulator-disk, and adapted to receive the screw-threaded shank y18 of a lock-nut 19, which'eiitends upwardly from the under side of' .said insulator-disk, said lock-nut being received in a countersunk opening in the uny ders-ideof said insulator disk. Each locknut is provided with a socket-member 20,

said socket-members being adapted to receive the free ends of the said field-wires 3, which are secured' in place by means of solder 2l, ooded over the same, or by any other suitable form of fastening means. Said shell llis filled with a water-proof insulating compound 22, in the space above 4said insulator disk, so that the same surrounds and protects the said upwardly eX-' ternally screw-threaded portion 26.I Lo

cated within the interior of said telescoping shell, at a desirable point between its ends, is an internal annular rib 27. Projecting from the inner side of said telescoping shell, andbeneat-h the said' internal annular rib 27, is a suitably located lug or key 28, which slidably engages said grov'e or channel 23 of said shell 11, and thus serves as a `guiding means for properly assembling the 'respective shells 11. and 24 `in their operative relations. Arranged within the upper portion of said telescoping sheil 24, so as to rest upon said l internal annular rib 27, is an insulator-disk 29, made ofany suitable material which is a nonconduictor of electricity. Carried by said insulator-disk 29 are a series of downwardly projecting male contact-members 30,

` each of which is provided with an internall screvththreaded reduced extension 31 extendy- Said tubular 'shell isA ing into said insulator-disk 29, and adapted to receive the screw-threadedshank 32 of a Y sunk. opening in the u per side of said insulator disk. Each loc nut 33 is provided with a socket-member 34, said members 34 being adapted to receive, the free ends of t-he feedfwires`3, contained in a feed-wire cable 36, the said ends bein secured in position by means'of solder 37 coded overthe same, or by means of other `suitable fastening means. vThe reference-character 38 indicates a waterprof insulating compound which is filled around 'the bases of said male-contactmembers,'so as t-o lill the space beneath said insulator-disk 29 flush with the lower side of said internal annular rib 27. Engaging said internally screw-threaded portion 26 of said telesco ing shell 24' is an externally threaded re ucin -union 39 which is formed with an internal y screw-threaded pening 40 in which is received the lower4 screwthreaded end of a tubular member "41; rSaid t-ubular-member 41 forms' the core upon vwhich is mounted a hand-grasp orother suitable manipulating member 42 Which is made of any desirable material thatis a nen-con ductor of electricity. Connected with the upper screwsthreaded vend of said tubular member 41 is a perforated cap-member 43. Said feed-wire cable 36 extends upwardly through said tubular member 41,and out through the perforation of the said capmember 43, said feed-wire cable 36 being embedded within the waterproof insulating compound v44 contained within saidv tubular member v41, whereby the said cable 36 is firmly and securely held in a manner to prevent the pulls and strains upon the same, in moving the motor from place to place, from being communicated to the feedwires 35, where the same are connected withsaid male contact-members 30.

When the said shells 11 and 24 are assembled, so as to bring t-herespective female and male contact-members, arranged within the respective shells, in proper electrical Contact or connectionwith each other, the two shells may be locked together by means of a lock-ring 45 which is provided at its lower-end with an internally screw-threaded portion 46, adapted to Aengage the screwthreads 13 of said flanged portion 12 of the shell 11 for this purpose. The upper end eoy of said lock-ring 45 is provided with an in- 1 wardly projecting annular 'flange 47 which engages said external annular rib or iange 25 ofsaid telescoplng shell 24,-so as to draw r the two shells together and lock them in their assembled relation, thereby holding the same rigidly and securely together, and preventing the communication of shocks,-

Jars, pulls,'or any other strains, from being communicated to the connected male and Ifemale contact-members, or to their respective connections with the feed wires and field-wires of the motor. If desired, packing material. 48 may be inserted between said annular vflange 47 and said annular rib or flange Q5, as will be clearly evident. To disconnect the feed-wires from electrical connection with said motor field-wires, the said lock-ring 45 is disconnected; and the hand-grasp portion 42 is grasped to exert an upward pull upon said telescoping shell 24 which separates the same from the shell 11,- and at the same time removes the said male contact-members from. said female oontact-menfbers, so that the electrical connection is broken. i:

The air space7 of said base-block provides a sufficient envelopment of air around the field-Wire terminals to prevent over heating; and, in like manner, the air-space 49 formed in said reducing union 39 pro- ,vides a suflicient eiivelopment of air around the feed-wire terminals to prevent overheating at that point. I

I am aware that changes may be made in the various arrangements and combinations .'of the several devices and parts, as well. as

in the details ofthe construction of the said parts, without departing from the scope ofv the present invention as described in the foregoing specification, and -as defined in the clauses of the claims which are appended thereto; Hence, I do not limit my invention to the exact arrangements and combinations of the various devices and parts as hereinl set forth in the said specification, nor do I confine myself to the exact details of` the construction of the .said parts, as illustrated in the accompanying drawings.

1. In a device of the character described, a shell, female contact-members mounted within said shell and insulated therefrom, a telescoping shell adapted to engage said tirst-mentloned shell, male contact-members mounted Within said telescoping shell and insulated therefrom, means for ri idly locking said shells in their en aged re ation, and guiding means connecte( with said shells for registering the same in proper relatlon with each" other.

2Q In a device of the character described, a shell,'a base-block upon which said shell is mounted, an insulator-disk mounted within saidl shell, female contact-members carried by said insulator-disk, said base-block beingprovided -With anv opening through which wires may, be introduced Within said shell and respectively secured to said female contact-members, a telescoping shell adapted to engage saidrst-mentioned shell, an upwardly extending tubular member, means `for connecting said tubular member with said 'telescoping shell, a hand-grasp portion connected with said tubular-member, an insulator-disk mounted within said telescoping shell, male contact-members carried by said4 insulatorfdisk, said tubular member providing means for introducing wires Within said telescoping shell and respectively secured to said male contact-members,` and means for rigidly locking said shells in their engaged relation.

3. Iri a device of the character described, a shell, a base-block upon which said shell is mounted, an insulator-disk mounted within said shell, female contact-members carried by said insulator-disk, said base-block being provided with an opening through which wires may be introduced within said shell and respectively secured to said female contact-members, a telescoping shell adapted to engage said first-mentioned shell, an upwardly extending tubular member, means for connecting said tubular member with said telescoping shell, a hand-grasp-portion connected with said tubular-member, an insulator-disk mounted within said telescoping shell, lmale contact-members carried by said insulator-disk, said tubular member providing means for introducing wires within said telescoping shell and respectively secured to said male contact-members, means for rigidly locking said shells in their engaged relation, and guiding means connected with said shells for registering the same in proper relation with each other.

4. In a `device of the character described, a shell, a base-block upon which said shell iis mounted, an insulator-disk mounted within said shell, female contact-members carried by said insulator-disk, said base-block being provided with an opening through which wires may be introduced Within said shell and respectively secured to said female contact-members, a telescoping shell adapted to engage said first-mentioned shell, an upwardly extending tubular member, means for connecting said tubular member with said telescoping shell, a hand-grip portion connected withsaid tubular-member, an in` sulator-disk mounted within said-telescop ing shell, male contact-members-carriedby said insulator-disk, said tubular member providing means for introducing wires within said telescoping shell andl respectively secured 'to said male contact-members, l

ldisk mounted therein, female contact-members supported by said insulator-disk, a removable telescopingtubular shell adapted toA engage said rigidly secured tubular shell,

an insulator-disk mounted within said telescoping tubular shell, male contact-members supported thereby, a cable-receiving means 'connected' with said telescoping tubular shell, means for rigidly locking said telescoping tubular shell -in its engaged relation with said rigidly secured tubular shell, lo' comprising an exterio'rly threaded flange connected with said rigidly secured tubular shell, an external annular rib/connected with said telescoping tubular shell, an internally screw-threaded lock-ring adapted to screw upon said exteriorly threaded flange, an in- .ternal-.annular rib connected with said lockring adapted to. be brought into holding en-4 gagement with said external annular rib of said telescoping tubular shell. l y 6. In la device of the. character described,I a rigidly secured tubular shell, an insulatordisk mounted therein, female contact-meinbers supported by said insulator-disk, a r'e- "movable telescoping tubular shell adapted to engage said rigidly secured tubular shell,

an 'insulator-disk mounted within said'tele-v scoping tubular shell, Amale contact-members supported thereby, a cable receiving means connected with said telescopin'g tubular shell, means for rigidly locking said telescoping tubular shell in its engaged relation with said rigidly secured tubular shell, com-` prising an exteriorly threaded flange con-l nected `with said rigidly secured tubular J shell, an external annular. rib connected with said telescoping tubular shell, an internally screw-threaded lock-ring adapted to screwy upon said "exteriorly threaded flange, an in- -v ternal annular rib connected with s'aid lock- 40 ring adapted to be brought into holding engagement with said external annular rib of said telescoping tubular shell, and guiding .'.means'connected with said respective shells 't orV registering the same in proper relation with each other.

' l7. In a device of the character described,

a rigidly Asecured tubular shell, an insulatordisk mounted therein, female contact-members supported by said insulator-disk, a removable telescoping tubular shell adapted to engage said rigidly secured tubular shell,

-an insulator-disk mounted within said .telescoping tubular'sliell, male contact-members.

supported thereby, a cable-receiving means 55. connected with said telesco ing tubular shell, means .for rigidlylocking said televscoping tubular shell in its engaged relation with said -rigidly secured tubular shell, comprisin'g an exterior-ly threaded flange connectedwith said rigidly secured tubular shell, an external annular rib conne'cted with said telescoping tubular shell, an internally screw-threaded lock-ring adapted to screw upon said exteriorly threaded fiange, an internal annular rib connected Withsaid lockmeneer ring adapted 'to be brought intoholding engagement with said external annular rib of said telescoping tubular shell, and guiding.

means connectedwith said respective shells for registering the saine in proper relation with each other, comprising a vertical channel exteriorly disposed upon said rigidly secured tubular shell, and a key interiorly disposed upon said telescoping tubular shell.

8. A- coupling for connecting the fieldwires of a motor with the potential 4feedwires, comprising a fixed shell,V means for rigidly securing said fixed shell to the motor, an linsulator-disk mounted within said fixed shell upwardly extending female contactmem ers carried by said insulator-disk,

means for connecting the motor-field wires with said female contact-members, an exteriorly screw-threaded annular flange at the lower. end of said fixed shell, a removable vshell adapted to telescope over said-fixedA shell, means for rigidly connecting a feedwire cable with relation to said removable shell, an insulator-disk mounted within said removable; shell, downwardly extending male contact-members carried by said -insulator disk and adapted to contact with said female contact-members when said fixed shell is engaged by said removable shell, means for connecting thev feed-wires of said an interiorly screw-threaded lock-ring adapted to engage said exteriorly screwthreaded annular flange of said fixed shell, and means connected with said removable shell adapted to be engaged by said locking Y ring to rigidly bind said Vsl-iells in their assembled relation.

9. A coupling for connecting the fieldwires of a motor with the potential feedwires, comprising a fixed shell, means for rigidly securing said fixed shell to the motor,

an insulator-disk mounted within said fixed shell, upwardlyl extending female contact-l p members carried by said insulator-disk,

means for connecting the motor-field wires with said female contact-members, an exteriorly screw-threaded annular flange at the lower end of said fixed shell, a removable shell adapted to telescope over said fixed shell, means for rigidly connecting a feedfeed-cable with said male contact-meinbers,

iis

wire cable with relation to said removable ring to rigidly bind said shells in their assembled relation, and guiding means connected Withsaid' respective shells for registering the same in proper relation With each other.

10.A coupling for connecting the fieldwires of a motor with the potential feedwires, comprising a fixed shell, means for rigidly securing said fixed shell to the motor, an insulator-disk mounted Within said fixed shell, upwardly extending female contactmembers carried by said insulator-disk, means for connecting the motor-field Wires with said female contact-members, an exteriorly screw-threaded annular flange at the lower end of said fixed shell, a removable shell adapted to telescope over said fixed shell, means for rigidly connecting a feedwire cable with relation to saidremovable shell, an insulator-disk mounted Within said removable shell, downwardly extending male contact-.members carried by said insulatorl disk and adapted to contact with said female contact-members when said fixed shell is engaged by said removable shell, means for connecting the feed-Wires of said feed-cable with said male contact-members, an interiorly screw-threaded lock-ring adapted to engage said exteriorly screw-t readed annular flange of said fixed shell, and means` connected with said removable shell adapted to be engaged by said locking ring to rigidly bind said shells in their assembled relation, and spectlve shells for registering the same in proper relation with each other, com rising a vertical channel. exteriorly dispose upon said fixed shell, and a key interiorly disposed upon said movable shell adapted to ride in said verticalchannel.

In testimony, that I claim the invention setforth above I have hereunto set my hand this 8th day of November, 1911.

GEORGE J. HARTMANN.

Witnesses GEORGE D. RICHARDS, ADOLPH HANSEN.

guiding meansconnected with said re 

